SIMULATION NUMERIQUE DU COMPORTEMENT DE REACTEURS TUBULAIRES DE TRAITEMENT HYDROTHERMAL DE DECHETS EN REGIME D'ECOULEMENT LAMINAIRE

摘要

The thermal oxidation of organic wastes in supercritical water is now a well-known process in several laboratories. Most of supercritical water oxidation reactors are tubular and the flow regimes are turbulent. In order to have an acceptable residence time, the lengths of the reactors are important. It is also possible to develop reactors in laminar flows. The purpose of this work is to simulate tubular reactors with laminar flows. The program makes an assumption of two-dimensional flow. However, several thermal boundary conditions were used (adiabatic reactor, constant heat flux, constant wall temperature and co or counter-current exchanger). For each boundary condition, the concentration and temperature profiles were determined along the reactor.